item groups now have order - start page is now item group 1 (configurable in globals)

front-api/db/migrate/20150420044444_create_item_in_groups.rb

@@ -0,0 +1,13 @@
+class CreateItemInGroups < ActiveRecord::Migration
+  def change
+    create_table :item_in_groups do |t|
+      t.integer :item_id
+      t.integer :item_group_id
+      t.integer :position
+
+      t.timestamps null: false
+    end
+
+    drop_table "item_item_groups"
+  end
+end

front-api/db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20150414214540) do
+ActiveRecord::Schema.define(version: 20150420044444) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -106,9 +106,12 @@ ActiveRecord::Schema.define(version: 20150414214540) do
     t.decimal  "price"
   end
 
-  create_table "item_item_groups", id: false, force: :cascade do |t|
-    t.integer "item_id",       null: false
-    t.integer "item_group_id", null: false
+  create_table "item_in_groups", force: :cascade do |t|
+    t.integer  "item_id"
+    t.integer  "item_group_id"
+    t.integer  "position"
+    t.datetime "created_at",    null: false
+    t.datetime "updated_at",    null: false
   end
 
   create_table "items", force: :cascade do |t|